I am not obviously a professional but shall be going along with my D800 plus the wife and our baby. I need to travel light and will take just one lens. What do I have to choose from... ? Nikon 50mm 1.4, 24-120f4, 105 VR Micro 2.8 and probably 18-35G. I favour the 50mm as its light sharp and will be good in low light however I was wondering what experienced wedding photographers would choose?

Easy, take an 85mm prime. The 1.8 is great old or new or a 1.4 if you can afford!